Abstract
This paper presents the result of Ha imaging for luminous and ultraluminous infrared galaxies. It is a complete subsample of the Great Observatories All-sky LIRG Survey (GOALS) with decl. >=-30 degrees, and consists of 148 galaxies with log(L-IR/L-circle dot). >= 11.0. All the H alpha images were carried out using the 2.16 m telescope at the Xinglong Station of the National Astronomy Observatories, Chinese Academy of Sciences (NAOC), during the year from 2006 to 2009. We obtained the pure H alpha luminosity for each galaxy and corrected the luminosity for [N II] emission, filter transmission, and extinction. We also classified these galaxies based on their morphology and interaction. We found that the distribution of star-forming regions in these galaxies is related to this classification. As the merging process advanced, these galaxies tended to have a more compact distribution of star-forming regions, higher L-IR, and warmer IR-color (f(60)/f(100)). These results imply that the degree of dynamical disturbance plays an important role in determining the distribution of a star-forming region.